Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2012

Stockholders' Equity [Abstract]

Summary of the activity with respect to stock options

	Shares			Weighted Average Exercise Price
Outstanding at September 30, 2009		936,500			7.05
Granted		126,000			25.04
Exercised		(244,900	)		8.93
Forfeited		(200	)		5.63
Expired		—			—
Outstanding at September 30, 2010		817,400			9.26
Granted		—			—
Exercised		(467,800	)		5.89
Forfeited		(4,000	)		8.78
Expired		—			—
Outstanding at September 30, 2011		345,600			13.82
Granted		—			—
Exercised		(99,644	)		13.63
Forfeited		—			—
Expired		—			—
Outstanding at September 30, 2012		245,956			13.90

Summary of stock Options outstanding and exercisable

	Options Outstanding								Options Exercisable
Range of Exercise Prices	Shares		Weighted Average Remaining Term (in years)		Weighted Average Exercise Price		Intrinsic Value		Shares		Weighted Average Remaining Term (in years)		Weighted Average Exercise Price		Intrinsic Value
$ 0 to $6.75		17,200		0.47	$	4.30	$	978,841		17,200		0.47	$	4.30	$	978,841
$6.76 to $9.99		144,756		6.2		8.78		7,588,833		73,756		6.2		8.78		3,866,658
$10.00 to $26.98		84,000		7.7		24.70		3,066,555		21,000		7.7		23.67		788,180
		245,956		6.3		13.90		11,634,229		111,956		5.6		10.88		5,633,679